Fertilizante organomineral em batata, cv. Atlantic: produtividade, crescimento e acúmulo de nutrientes em diferentes safras de plantio

Abstract

Potato is a vegetable of great economic importance, presenting high rates of fertilizer application. Therefore, there is a need to find alternatives that may minimize costs while favoring nutrient cycling. Organomineral fertilizers affect positively soil physical, chemical and biological characteristics, improving water and cation retention, aeration, porosity and the proliferation of microorganisms. Residues that would be culled, in respect to environmental concerns. This study evaluated growth, nutrient accumulation and tuber yield of potato cultivar Atlantic, using mineral or organomineral fertilizers, in two growing seasons, from May to October (winter) and from October to February (Summer), in commercial potato crops in Cristalina-GO. The experimental design was randomized blocks, in split plots, with four replications. The winter experiment had 6 doses, while the summer one had 7 doses. The doses were fixed according to the recommendation for mineral fertilizers. The doses evaluated were: 2800.00 kg ha-1 with formulation 3-32-6 and variations of 40% (1629.10 kg ha-1), 60% (2443.60 kg ha-1) 80% (3258.30 kg ha-1), 100% (4072.50 kg ha-1) and 120% (4887.00 kg ha-1) of the first one, using the organomineral fertilizer source. Doses were plots while plant collection dates were split plots, which were done biweekly from mounding to final harvest. A treatment with no fertilizer (control) was included in the summer experiment. The two middle rows were kept until the end of the experiment to determine tuber yield. Plant collection for analysis of growth and nutrient accumulation was done in the other rows of each plot. Greater yields were obtained in winter than in summer crop. The sequence of maximum nutrient accumulation in winter was K>N>S>Ca>P>Mg and Fe>Zn>Cu>Mn>B, at 61 days, while in summer accumulation was N>K>S>Ca>Mg>P and Fe>Mn>Cu>B>Zn, at 53 days. Plants of cultivar Atlantic had greater response to organomineral fertilizer under stressing conditions of summer crop.